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Color: Sample Color from Screen picks a color anywhere on the screen

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The Color Picker gets an eyedropper button beside the New and Original
chips, and `ui.sampleScreenColor {stroke?, picker?}` shows the system's
color sampler. The command answers at once. When the person clicks a
color anywhere on the screen, the color becomes the fill or the stroke
through paint.setFill / paint.setStroke as one undo step, or with
`picker` it becomes the open Color Picker's color, which previews on the
selection as any pick does. Escape cancels the sampler. The sampled sRGB
color goes through Cms::srgb_to_rgb, so in a Display P3 working space a
color inside sRGB shows as it did on the screen. `ui.inspect` reports
`screenSampler` while the sampler is open.

- macOS uses NSColorSampler (apps/vectorcraft/src/mac_screen_color.rs).
- The web app uses the browser's EyeDropper API where the browser has
  one.
- Without a sampler (Windows, Linux, other browsers) the button is gray
  and the command returns an error. Keyboard Shortcuts lists the
  command, so it can be given a key.

Docs: docs/control-protocol.md, docs/target-app-parity.md.
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dotCooCoo
2026-10-16 02:25:53 +07:00
committed by bflatastic
parent a14abc3177
commit 25df070576
25 changed files with 687 additions and 3 deletions
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@@ -139,6 +139,8 @@ fill or stroke (fields as in `swatchOptions` plus `group`; a gradient or pattern
The Color Picker is a dialog too: `engine.execute {command: "ui.colorPicker", params: {stroke?, color?}}` opens it for the fill (or stroke) proxy; `ui.dialog.set {field: "hex", value: "00FF00"}` (or `color`, `channel`, `webOnly`, `swatches`) then `ui.dialog.confirm` applies the colour through `paint.setFill` / `paint.setStroke`.
Sample Color from Screen: `ui.sampleScreenColor {stroke?, picker?}` shows the system's color sampler (macOS, and browsers with an EyeDropper) and returns `null` at once. When the person at the computer clicks a color anywhere on the screen, it runs `paint.setFill` (or `paint.setStroke`) with that color as one undo step, or with `picker: true` sets the open Color Picker's `color`; Escape cancels it and the colors stay as they were. The sampled display sRGB color is converted into the working RGB space. `ui.inspect` reports `screenSampler: true` until the sampler answers. Without a sampler (Windows, Linux, other browsers) the call returns an error. To read a color from VectorCraft's own window without a person, call `ui.screenshot`.
Graphic styles: `ui.graphicStyleOptions {name}` opens the `graphicStyleOptions` dialog (field `name`) for a style and
`ui.dialog.confirm` renames it with `graphicStyle.rename` (a name another style has returns an error and keeps the
dialog open); without `name` it names a new style made from the selection (`graphicStyle.new`).